CN104821570A - Circuit for eliminating coil surge - Google Patents
Circuit for eliminating coil surge Download PDFInfo
- Publication number
- CN104821570A CN104821570A CN201510268667.4A CN201510268667A CN104821570A CN 104821570 A CN104821570 A CN 104821570A CN 201510268667 A CN201510268667 A CN 201510268667A CN 104821570 A CN104821570 A CN 104821570A
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- China
- Prior art keywords
- circuit
- contactor
- coil
- resistor
- electrolytic capacitor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Emergency Protection Circuit Devices (AREA)
Abstract
A circuit for eliminating coil surge relates to the technical field of a switch cabinet control circuit. The circuit is characterized in that the circuit comprises a resistor, an electrolytic capacitor and a power frequency AC contactor, wherein the resistor is connected in series with the electrolytic capacitor, and a series circuit formed by the resistor and the electrolytic capacitor is connected in parallel with the power frequency AC contactor. The circuit is simple in structure and can effectively eliminate the overvoltage generated by a contactor coil in the on and off process, and thus safety, stability and continuity of the circuit are enhanced.
Description
Technical field
The present invention relates to switch cubicle control circuit technical field, be specifically related to the circuit eliminating coil surge.
Background technology
To there is overvoltage when disconnecting in switch cubicle control circuit contactor, this is owing to attempting to maintain the electric current passed through at the process of disconnection coil inductance, but the electric capacity by magnetic coil self is closed by circuit; If circuit has enough electric energy; mode with damping vibration is flow through coil by electric current and voltage; due to motional impedance when coil turns off; voltage amplitude is by the scope of several kilovolts; and rise with the speed of about 1kv/us; therefore the overvoltage that contactor coil produces in switching process will be eliminated, increase protective circuit.
In industry control controls, utilize contactor to control in electric equipment process, usually can produce overvoltage, main cause is the switching manipulation of inductive circuit; In the interrupting process of coil, overvoltage can reach rapidly very high value, the result caused:
1, contact corrosion greatly, and cause the contactor premature breakdown of coil motion;
2, interference signal may disturb, electronically controlled rub-out signal may be caused under certain conditions and damage electronic component.
Therefore, the coil switch of contactor is necessary to adopt protective circuit to suppress.
Summary of the invention
The object of this invention is to provide a kind of circuit eliminating coil surge, it is simple that it has structure, effectively can eliminate the overvoltage that contactor coil switch produces, add the features such as the fail safe of circuit, stability and continuity.
In order to solve the problem existing for background technology, the present invention is by the following technical solutions: it comprises resistance, electrochemical capacitor, industrial frequency AC contactor, resistance and electrochemical capacitor series connection, and the series circuit that resistance and electrochemical capacitor are formed is in parallel with industrial frequency AC contactor.
The advantage that this practicality has: when contactor control load equipment, no matter system is that in direct current or ac control circuit, it effectively can eliminate the overvoltage that contactor coil switch produces, and increases the fail safe of circuit, stability and continuity.
Accompanying drawing illustrates:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the contactor overpressure situation coordinate diagram not connecting optimized circuit;
Fig. 3 is for using contactor overpressure situation coordinate diagram of the present invention.
Embodiment
With reference to Fig. 1, it comprises resistance 1, electrochemical capacitor 2, industrial frequency AC contactor 3, and resistance 1 and electrochemical capacitor 2 are connected, and the series circuit that resistance 1 and electrochemical capacitor 2 are formed is in parallel with industrial frequency AC contactor 3.
With reference to Fig. 2, this figure is a switch overpressure situation not connecting the contactor coil of any optimized circuit, which show contactor to control " instantaneous discharge " damping vibration that magnetic coil energy causes decline cycle and will appear at the peak value of 3.5kv, the very big corrosion that instantaneous discharge will cause switch machine to get an electric shock, in addition, due to the voltage waveform that capacitive path outlet is very steep, signal disturbing will be produced to contiguous electric/electronic device, there is capacitive coupling, produce other electric misoperations.
With reference to Fig. 3, this figure is existing for above problem inlet wire optimization increase protective circuit, at the superpotential origin place of generation, directly eliminates, concrete grammar is RC element circuitry, namely the combinational circuit be made up of electric capacity and resistance electronic component in the parallel connection of contactor coil two ends, can make the raising of the electric capacity of coil, is 2 to 3 times that amplitude reduces to control voltage, and reduce the steepness of switch overvoltage, reduce further instantaneous discharge, before being discharged gradually, voltage transient shakes 400V; Therefore; the responsive output stage of RC circuit protection dv/dt, to avoid the straight-through circuit through optimizing of switch, avoids in Switch Cut-through or overvoltage that turn off process produces; go out effectively to have cut off the misoperation that instantaneous discharge is brought at occurring source, protect the sustainability of circuit.
Claims (1)
1. eliminate the circuit of coil surge, it is characterized in that it comprises resistance, electrochemical capacitor, industrial frequency AC contactor, resistance and electrochemical capacitor series connection, and the series circuit that resistance and electrochemical capacitor are formed is in parallel with industrial frequency AC contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268667.4A CN104821570A (en) | 2015-05-25 | 2015-05-25 | Circuit for eliminating coil surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268667.4A CN104821570A (en) | 2015-05-25 | 2015-05-25 | Circuit for eliminating coil surge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104821570A true CN104821570A (en) | 2015-08-05 |
Family
ID=53731782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510268667.4A Withdrawn CN104821570A (en) | 2015-05-25 | 2015-05-25 | Circuit for eliminating coil surge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104821570A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342440A (en) * | 2020-04-02 | 2020-06-26 | 南京工程学院 | Tokamak plasma breaks and adds thermal field overvoltage protection circuit |
-
2015
- 2015-05-25 CN CN201510268667.4A patent/CN104821570A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342440A (en) * | 2020-04-02 | 2020-06-26 | 南京工程学院 | Tokamak plasma breaks and adds thermal field overvoltage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20150805 |